Pipe-cutter.



I. W. NONNEIVIAN.

PIPE CUTTE R, APPLICATION FILED FEB. 8, I917.

Patented April 6, 1918.

2 SHEETSSHEET 1- JWYENIOR.

M (div? Arr-fa I. W. NONNEMAN.

PIPE CUTTER.

APPLICATION FILED FEB. 8. 1911.

1,262,690. Patented Apr. 16, 1918.

2 SHEETS-SHEET 2.

Era-' 2,-

FIG; 5

IZYYENIOR 517 29am) Wae%fl&/

UNTTED STATES PATENT OFFICE.

IRA W. NONNEMAN, OF WARREN, OHIO, ASSIGNOR TO THE BORDEN COMPANY, OF WARREN, OHIO, A CORPORATION OFOHIO.

PIPE-CUTTER.

Specification of Letters Patent.

Application filed February 8, 1917. Serial No. 147,420; V:

To all whom it may concern:

Be it known that I, IRA W. NONNEMAN, citizen of the United States, residing at \Varren, in the county of Trumbull and State of Ohio, have invented a certain new and useful Improvement in Pipe-Cutters, of

and cheapness of the entire construction.

My invention resides in the means by which 1 accomplish these objects, or any of them, as hereinafter more fully explained. Accordingly, the invention may be summarized as consisting of the combination of cooperating elements herein described and summarized in the claims.

The drawings illustrate my invention embodied in a duplex cutter of the open-side type. Figure 1 is an edge view of the cutter. Fig. 2 is a side elevation thereof. Each of these views shows the cutter in position on a pipe. Fig. 3 is a cross section of the cutter showing the guide rolls, the bearing disks for each roll being shown at one end in section and at the other end in edge elevation. Fig. A is a detail, being a section substantially on the axis of one of the guide rolls; Fig. 5 is a cross section of the cutter across the feed screw, as indicated by the line 5-5 on Fig. 2. Fig. 6 is a side elevation of one of the cutting knives and the two guide rolls, with which it coacts; Fig. 7 is a diagram of forces illustrating the compensating movement of the guide rolls and knives.

The frame of the cutter consists primarily of two end brackets 10 and 11 and two parallel bars 12 and 13 riveted to these brackets, preferably by rivets 1 1 and 15. A longitudinal groove 21 is formed in the inner side of one of the bars, as 13, which is occupied by a longitudinal key 16. 20 indicates a movable bracket which has a tongue 21 ex:

tending between the bars 12 and 13 and guided in the space between them by reason of a groove on the side of the tongue, which is occupied by the key '16. The movable bracket is put in place before the rivets 14 and 15 are secured, and then the upsetting of these rivets simply and effectively retains the bracket slidably in place.

As shown the stationary bracket 10 and the movable bracket 20 each carry a pair of guide rolls 40 and a knife 50, these elements coacting with opposite sides of an interposed pipe A. The feeding is efi'ected by a screw 30 which is threaded in the bracket 11 and swiveled to the movable bracket 20. While I prefer to make the cutter duplex as shown, one knife may be used, carried by either of the brackets, the pipe on the opposite side being simply guided by rollers.

Each knife is preferably in the form of a flat'blade having a cutting edge 51 and an adjacent limiting shoulder 52. The knife stands within a recess in the bracket 10 or 20, as the case may be, and is retained in place by suitable gibs 55 secured to the bracket and overlapping the knife. Each bracket 10 and 20 is formed with an oifset forked portion providing flanges, respectively designated 17 and 27, connected with the body of the bracket by transverse portions and webs 18 and 28. In the recesses provided by these forks the two sets of rollers 4:0, referred to, are journaled. The means for carrying the guide rollers and knives, by the respective brackets, are thus substantial duplicates.

A peculiarity of the guide roller and knife mounting illustrated, is that each knife is coupled with the corresponding pair of guide rollers by mechanism which allows the knife and such pair to move compensatingly. That is to say, if the rollers give back, the knife moves forward, and vice versa. I have found that when a knife is accompanied by a stop shoulder normally limiting the inward cutting movement, it is possible. without harm, to crowd the knife farther into the stock. Now by coupling the guide rollers with the knife, as if they were on opposite ends of an intermediately pivoted lever, the guide rollers by bearing against the pipe normally prevent outward movement of the knife; but, in case of a protuberance or irregularity on the pipe, the

Patented Apr. 16, 1918.

rollers may give backwardly and the cutters be crowded farther into the pipe. This prevents such irregularity of the pipe from throwing a strain on the cutter frame, such strain in the past having been sometimes suflicient to break the frame.

The equalizing connection between the guide rollers and the knife is effected in the embodiment shown of the following described mechanism: Each guide roller a0 is freely journaled about a coaxial pin 42. This pin has, at its ends, trunnions a?) and 44 which extend eccentrically into bearing disks 45 and i6. These trunnions are rigidly secured to the disks, as by upsetting the ends of the trunnions, as shown at i7. This upsetting locks the pin to the two eccentric disks on opposite sides of the roller, so that the roller is supported on this eccentric bearing at each side. The roller is larger in diameter than the eccentrics, and thus overlaps the bearing of the eccentrics and prevents lateral shifting in either direction. Accordingly, this upsetting of the pins locks all these parts together. Each of the eccentrics 46 is provided with an eccentrically positioned pin 49. The pins 49 from two of the eccentrics occupy a transverse slot 54: in the corresponding knife.

The result of the above construction is that as the knives and rollers are fedtoivard each other from opposite sides of the pipe by turning in the screw 30, the thrust is taken partly by the rollers 40 and partly by the knife 50, the eccentric connection be tween the rollers and knife equalizing this pressure. As the surface of the pipe limits the position of the rollers, it isobvious that the turning in of the screw feeds the cutters into the pipe. Now, if in the rotation of the tool about the pipe, one of the rollers encounters a protuberance, it gives back slightly, and, in doing so, turns the eccentries 45 and L6 which feed the cutter farther into the pipe. The limiting shoulder 52 on the cutter prevents the knife cutting unduly deeply insuch movemeent and insures the playing back of the knife as soon as the obstruction is cleared.

Fig. 7 isa diagram illustrating the compensating operation of the rollers and knives. In this view it will be seen the thrust on the roller 40 is fromthe center ,of thepipe A radial-1y toward the center of the rollerpas indicated by the line B. This line of action, however, is at the outer side of the center .E of the eccentric, wherefore the tendency is -to'turn. the eccentrics bringing their inner iportionsinwardly =01 toward the pipe. This moves the pins 49 carried by these eccentrics toward the pipe, which shoves theknife inwardly. Conversely, the outward movement of the knife carries the pins 49 away from the pipe and swings .the eccentrics in the direction to move the rollers toward the pipe. It is therefore as if the knife and roller were on opposite ends of a lever indicated by the line L pivoted at E.

The equalizing movement described does not interfere at all with the ordinary cutting action of the tool but saves it from strain, caused by the irregularities which very frequently occur in pipes. The cutters are fed in the usual manner by turning the screw 30 from time to time as the rotation of the frame proceeds.

The pair of guide rollers, the knife and their connecting compensating mechanism form a unit, of which any desired number may be used with a suitable frame,either more or less than the two units shown. As already referred to, in place of the duplex cutting tool shown, one of the knives might be omitted and simply one or more guide rollers provided on that side. However, the invention adapts itself very readily to embodiment in a duplex cutting tool without increasing the size thereof and at slight additional. cost.

The feed screw 30 is swivelcd in any suitable manner to the bracket 20. As shown it extends into a socket 25 in the bracket and is held therein by a set screw 26 which screws into an annular groove in the end portion of the feed screw. The feed screw is provided with a suitable handle 32 for turning it. This handle is shown .as secured to the feed screw at? and having a pair of arms by which may be turned and having in its outer face an axial screw -thr,eaded socket 35 into which an extension handle 36 may be screwed This extension handle is similar to .a handle 37 which is screwed into the socket 19 of the bracket 10. The handles 36 and 37 are removable for compact ness, as is usual.

Having thus described my invention, what I claim is: i

1. In a device oft-he character described, the combination with a frame, of a guide member and a cutter each :inovably carried thereby, an eccentric equalizing-mechanism connected with the guide member and the cutter, and means whereby outward -move ment of the guide member turns the eccentrio and the turning of the eccentric moves the cutter inwardly.

2. In a pipe cutter, the combination with a frame, ofa guide .rol ler carried by the frame on a shiftable axis, a knife movably carried by the frame, an eccentric equalizing mechanism connected with the guide roller and the knife, and means whereby movement of one of the last mentioned membersturns the .eccentric and the turning of theeccentricmoves the other of said members.

3. In .a pipe cutter, .the combination of a frame, a knife movably carried vthereby, a guide roller, an eccentrica'lly mounted bearing on which the roller is concentrically journaled, and mechanism connecting such bearing with the knife. I

4. The combination, with a frame, of a knife slidably carried thereby, a guide roller, a pin on which the roller is mounted, an eccentric bearing for said pin, and a connection between said bearing and the knife.

5. In a pipe cutter, the combination of a frame, a guide roller, an eccentrically mounted bearing about which the roller may rotate concentrically of itself, said bearing having a projecting pin, and a movable knife having a transverse slot occupied by said pin.

6. The combination of a frame, a slid'able knife carried thereby, a pair of guide rollers, a pair of eccentrically mounted bearings on which the guide rollers rotate on their respective axes, and a' connection betwccn the two bearings and the knife.

7. The combination of a frame, a slidable knife carried thereby, a pair of guide rollers, a pair of eccentrically mounted journals on which said guide rollers may r0- tate concentrically of themselves, and a pin and slot connection between the two journals and the knife.

8. The combination of a frame, a pair of guide rollers, a pair of journals respectively at the axes thereof and eccentrically mounted in the frame, pins projecting from the respective journal bearings, and a knife having a transverse slot occupied by said pins.

9. The combination with a rotatable frame, of a slidably mounted knife carried thereby having a transverse slot in it, a pair of guide rollers, pins at the axes of said rollers. on which the rollers are journaled, eccentric circular heads on said pins journaled in the frame, and crank pins extending from said heads into the slot in the knife.

10. The combination of a frame, a slidable knife therein having a cutting edge and a stopping shoulder, a guide rollerhaving a shiftable journal, and a compensatin connection between said journal and the ife.

11. The combination of a frame, a slidable knife therein having a cutting edge and a stopping shoulder, a guide roller, an eccentrically mounted bearing ,on which the roller is rotatable concentrically of itself, and a pin and slot connection between said bearing and the knife.

12. The combination of a frame, a knife movably carried thereby, a bearing pin, a roller concentrically journaled on said pin, a pair of eccentric heads for the pin on opposite sides of the roller and carried by the frame, and a connection between one of said heads and the knife.

13. The combination of a frame, a pair of guide rollers, pins on which said rollers tween one of themselves, each pin having a pair of ec-v centric heads located respectively on opposite sides of the roller and journaled in the frame, a knife movably mounted in the frame, and a pin and slot connection between eccentric heads of the two rollers and said knife.-

14. The combination of a frame, a pair of guide rollers, pins onwhich said rollers are respectively journaled concentrically of themselves, each pin having a pair of eccentric heads located respectively on opposite sides of the roller and journaled in the frame, a knife slidably mounted in the frame and having a transverse slot, and eccentric pins on two of said eccentric heads extending into said slot.

15. The combination of a frame having a forked bracket, a guide roller between the arms of the bracket, bearing disks rotatably mounted in said arms respectively, a P111 rigidly connected with thetwo bearing disks eccentrically thereof and forming intermediately a bearing ournal for the roller (3011'- centrically of the roller, said roller having a diameter greater than that of the bearing disks, a movable knife, and aconnection bethe bearing disks and the knife. I

16. The combination of a frame having a forked bracket, a pair of guide rollers be tween the arms of the bracket, two pairs of bearing disks rotatably mounted in said arms respectively, two pins having their ends rigidly connected each with two of the bearing disks eccentrically thereof and forming intermediately bearing journals for the respective rollers, a knife movably guided on the frame and having a transverse slot, and a pair of eccentric pins extending from bearing disks'of the two rollers and occupying said transverse slot.

17. .The combination of a frame, stationary and movable brackets carried thereby, a screw for feeding the movable bracket, and a cutting and guiding unit carried by each bracket and comprising a shiftable bearing roller, a movable knife, and an equalizing connection between the two including an eccentric adapted to be-turned by the shifting of the bearing roller and operating to shift the knife.

18. The combination of a frame, a pair of brackets carried thereby, one of which is movable, a screw mounted in the frame and connected with the movable bracket, whereby the same may be advanced, and a cutting and guiding unit carried by each bracket, said unit comprising a knife having a cutting edge and a stopping shoulder, a pair of rollers journaled on pins which are eccentrically mounted, and eccentric connections between said pins and the knife.

19. In a device of the character described,

the combination ofa pair of frame-brackets,

a pair of spaced longitudinal bars engaging said brackets and :secured thereto, an intermediate movable bracket having a tongue extending. between said bars, a screw threaded in one of the. frame brackets and having a swivel connection with the movable bracket, and two cutting and guiding'units carried respectively by; the movable bracket and the other frame bracket, each of-said' one of'said bars for slidably guiding the movable bracket, a cutter and a pipe guide carrled respectlvely by the-movable bracket andone of the frame brackets, and means for feeding the movable bracket toward the frame bracket, and-having a swivel connection with the movable bracket.

21. In a device of the character described,

the combination of a pair of frame brackets each having a tongue, a pair of spaced longitudinal bars engaging opposite sides of said tongues and rigidly secured thereto, a key carried by one of the longitudinal bars along its inner face and extending onto the two frame brackets, a movable bracket having a tongue extending between said-bars and provided with a groove which embraces said key, a cutter and pipe-guide carried respectively by the movable bracket and one of the frame brackets, and means for feeding the movable bracket toward the last mentioned frame bracket.

22. In a device of the character described, the combination of a pair of frame brackets eachhaving a tongue, a pair of spaced longitudinal bars engaging opposite sides of said tongues and secured thereto, a movable bracket having a tongue extending between said bars, means for guiding the latter tongue longitudinally of the bars, a cutter and a pipe-guide carried respectively by the movable bracket and one of the frame brackets, and means for feeding the movable bracket toward the last-mentioned frame bracket.

In testimony whereof, I hereunto aflix my signature.

IRA W. NON N El /IAN.

@ontcczcfl thto;. patcnt,maybe 'cbtained-forfive cents each, by addressing the Commissioner of Patents.

- Washington, D. G. 

